Step 4: Dry the seeds
Spread the flower heads out on newspaper and leave in a cool, dry, airy place to allow the seeds to fully dry. You’ll know the flower heads are ready when they feel dry and crumbly to the touch.
Don’t put your seeds in an airing cupboard to dry! This will be far too warm and will damage the seeds.
When the seeds and flower heads are all dried out, you can release the seeds by gently crushing the flower heads. Gently shaking the crushed material in a jar or other container should cause the seeds to fall to the bottom, allowing you to remove any small pieces of dried-up plant or flower from the top.
But don’t worry about getting the seeds completely clean! This would be a fiddly process and isn’t necessary. The seeds will grow just as well with other pieces of organic matter mixed in.
Step 5: Store the seeds
You can sow seeds in autumn, but you can also store them for sowing later.
Place your seeds in a cotton bag or a simple paper envelope. Never store your seeds in plastic because this can cause condensation to form which will make the seeds damp and mouldy.
Store your seeds in a cool, dry place – the fridge is good, but be very careful the seeds don’t get mistaken for food!
Keep your seeds like this and they should last for one year. But the sooner you can sow your seeds, the better!